American Institute of Certified Planners (AICP) Practice Exam

The case that involved the Sierra Club attempting to block a ski resort development is indeed Sierra Club v. Morton. This landmark Supreme Court case, decided in 1972, addressed the legal standing of organizations such as the Sierra Club to bring suit for environmental protection and the significance of ecological preservation in development decisions.

In this case, the Sierra Club sought to prevent the development of a ski resort in the Mineral King Valley, which was considered a pristine area and an important ecosystem. The Supreme Court's ruling highlighted the necessity for organizations to demonstrate that their members would be harmed by the proposed developments and set important precedents regarding environmental advocacy and judicial standing for non-profit organizations.

While other cases listed involve land use and governmental authority, none specifically focus on the environmental activism of the Sierra Club related to a ski resort, making this particular case the most relevant to the question.